Simple experiments show that color perception is color in context. The yellow square on the left and the blue square on the right are actually the same color, depicted as a diamond at the bottom of the image.

The Influence of Color

Artists have long known that things at a distance look bluer. Leonardo Da Vinci noted the technique in his notes, later collected as the Treatise on Painting, and used the effect in the background of the Mona Lisa.

Color Blindness

no color blindness

protanopia

deuteranopia

tritanopia

The 3 different types of cones in the eye explain three different kinds of color-blindness: trichomats, protanopes, and deuteranopes.